CoGroupedStreams

CoGroupedStreams represents two DataStreams that have been co-grouped. A streaming co-group operation is evaluated over elements in a window.

To finalize the co-group operation you also need to specify a KeySelector for both the first and second input and a WindowAssigner

Note: Right now, the groups are being built in memory so you need to ensure that they don't get too big. Otherwise the JVM might crash.

Example:

val one: DataStream[(String, Int)]  = ...
val two: DataStream[(String, Int)] = ...

val result = one.coGroup(two)
   .where(new MyFirstKeySelector())
   .equalTo(new MyFirstKeySelector())
   .window(TumblingEventTimeWindows.of(Time.of(5, TimeUnit.SECONDS)))
   .apply(new MyCoGroupFunction())
}